1 /*
2  * Copyright (c) 2012 Darren Tucker (dtucker at zip com au).
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include "includes.h"
18 
19 #include <sys/types.h>
20 
21 #include <stdarg.h>
22 #include <unistd.h>
23 #include <string.h>
24 
25 #include "log.h"
26 
27 #if !defined(HAVE_SETRESGID) || defined(BROKEN_SETRESGID)
28 int
29 setresgid(gid_t rgid, gid_t egid, gid_t sgid)
30 {
31 	int ret = 0, saved_errno;
32 
33 	if (rgid != sgid) {
34 		errno = ENOSYS;
35 		return -1;
36 	}
37 #if defined(HAVE_SETREGID) && !defined(BROKEN_SETREGID)
38 	if (setregid(rgid, egid) < 0) {
39 		saved_errno = errno;
40 		error("setregid %lu: %.100s", (u_long)rgid, strerror(errno));
41 		errno = saved_errno;
42 		ret = -1;
43 	}
44 #else
45 	if (setegid(egid) < 0) {
46 		saved_errno = errno;
47 		error("setegid %lu: %.100s", (u_long)egid, strerror(errno));
48 		errno = saved_errno;
49 		ret = -1;
50 	}
51 	if (setgid(rgid) < 0) {
52 		saved_errno = errno;
53 		error("setgid %ul: %.100s", (u_long)rgid, strerror(errno));
54 		errno = saved_errno;
55 		ret = -1;
56 	}
57 #endif
58 	return ret;
59 }
60 #endif
61 
62 #if !defined(HAVE_SETRESUID) || defined(BROKEN_SETRESUID)
63 int
64 setresuid(uid_t ruid, uid_t euid, uid_t suid)
65 {
66 	int ret = 0, saved_errno;
67 
68 	if (ruid != suid) {
69 		errno = ENOSYS;
70 		return -1;
71 	}
72 #if defined(HAVE_SETREUID) && !defined(BROKEN_SETREUID)
73 	if (setreuid(ruid, euid) < 0) {
74 		saved_errno = errno;
75 		error("setreuid %lu: %.100s", (u_long)ruid, strerror(errno));
76 		errno = saved_errno;
77 		ret = -1;
78 	}
79 #else
80 
81 # ifndef SETEUID_BREAKS_SETUID
82 	if (seteuid(euid) < 0) {
83 		saved_errno = errno;
84 		error("seteuid %lu: %.100s", (u_long)euid, strerror(errno));
85 		errno = saved_errno;
86 		ret = -1;
87 	}
88 # endif
89 	if (setuid(ruid) < 0) {
90 		saved_errno = errno;
91 		error("setuid %lu: %.100s", (u_long)ruid, strerror(errno));
92 		errno = saved_errno;
93 		ret = -1;
94 	}
95 #endif
96 	return ret;
97 }
98 #endif
99